After a period of rest, there was a full restoration of his normal vision.

restoration 是名词，由动词 restore（恢复、修复）加上名词后缀 -tion 构成。restore 本身由前缀 re-（表示“重新”）和词根 store（储存、保存）组成，字面意思是“重新储存/保存”，引申为“恢复、修复”。restoration 指“恢复、复原”的状态或过程。